Look, up in the sky: It's supermoon!

Earth's natural satellite to be full, large and close Saturday

11:31 PM,
Jun. 21, 2013

A supermoon rises behind the Temple of Poseidon in Cape Sounion, Greece, southeast of Athens, May 5, 2012. The phenomenon, which makes the moon appear 14 percent larger than normal, occurs when the moon passes closer to Earth than usual. This will happen Saturday night.

Written by

Doyle Rice
| USA Today

A supermoon occurs when the moon is slightly closer to Earth than it typically is, and the effect is most noticeable when it occurs at the same time as a full moon, according to James Garvin, chief scientist at NASA's Goddard Space Flight Center in Greenbelt, Md. ...